/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/Nodes/RigVMCollapseNode.h
The Collapse Node is a library node which stores the function and its nodes directly within the node itself.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class URigVMCollapseNode : public [URigVMLibraryNode](API\Plugins\RigVMDeveloper\RigVMModel\Nodes\URigVMLibraryNode)